Hadad, Haddad, Adad, or Iškur (Sumerian) was the storm and rain god in the Canaanite and ancient Mesopotamian religions. He was attested in Ebla as "Hadda" in c. 2500 BCE. From the Levant, Hadad was introduced to Mesopotamia by the Amorites, where he became known as the Akkadian (Assyrian-Babylonian) god Adad. Adad and Iškur are usually written with the logogram 𒀭𒅎 dIM—the same symbol used for the Hurrian god Teshub. Hadad was also called Pidar, Rapiu, Baal-Zephon, or often simply Baʿal (Lord), but this title was also used for other gods. The bull was the symbolic animal of Hadad. He appeared bearded, often holding a club and thunderbolt while wearing a bull-horned headdress. Hadad was equated with the Greek god Zeus, the Roman god Jupiter, as well as the Babylonian mythology Bel.

A weather god or goddess, also frequently known as a storm god or goddess, is a deity in mythology associated with weather phenomena such as thunder, snow, lightning, rain, wind, storms, tornadoes, and hurricanes. Should they only be in charge of one feature of a storm, they will be called after that attribute, such as a rain god or a lightning/thunder god. This singular attribute might then be emphasized more than the generic, all-encompassing term "storm god", though with thunder/lightning gods, the two terms seem interchangeable. They feature commonly in polytheistic religions, especially in Proto-Indo-European ones.